interface Lamp{
    void switchOn();
    void switchOff();
    void replaceBulb(Bulb bulb);
}

class Bulb{}

class BatteryPoweredLamp implements Lamp{
    private double batteryEnergy;
    
    void setBatteryEnergy(double energy){
        batteryEnergy=energy;
    }

    double getBatteryEnergy(){
        return batteryEnergy;
    }

    @Override
    public void switchOn() {}

    @Override
    public void switchOff() {}

    @Override
    public void replaceBulb(Bulb bulb) {}
    
}

public class Aufgabe4 {

    public static void main(String[] args) {        

    }

}
